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Pervaporation Dehydration of Azeotropic Water/Acetonitrile Mixture Using High Water Affinity PVA–PVAm Blended Membrane
Author(s) -
Chaudhari Shivshankar,
Kwon Yongsung,
Shon MinYoung
Publication year - 2019
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11668
Subject(s) - pervaporation , acetonitrile , glutaraldehyde , membrane , chemistry , chemical engineering , extractive distillation , vinyl alcohol , solvent , azeotropic distillation , azeotrope , chromatography , distillation , polymer , organic chemistry , permeation , biochemistry , engineering
Acetonitrile and water forms an azeotropic mixture having a boiling point of 76.5 °C and containing approximately 82.2 wt % acetonitrile under atmospheric pressure. Accordingly for their separation, heterogeneous distillation, extractive distillation, and solvent extraction have been used. The recovery of solvent and solute from the extract phase can usually be done by additional distillation processes, which ultimately lead to a less economical and energy intensive pathway. The hydrophilic polymers, poly(vinyl alcohol) and poly(vinyl amine) were used to prepared blended membrane and crosslinked them using glutaraldehyde as crosslinking agent. The FTIR, XRD, DSC, SEM, and swelling studies techniques were used to characterize all the blended membranes and applied for pervaporation separation of water/acetonitrile feed mixtures. Comparison of pervaporation data with water–acetonitrile vapor–liquid equilibrium data confirmed that the membrane acted as a third phase to effectively break azeotropes.